Analysis of Electronic Transformer Interference Test Based on Gas Switching Insulation Equipment

As an important electrical measurement device in high-voltage power systems, electronic transformers are susceptible to electromagnetic interference from disconnecting switch opening and closing operations, which can lead to circuit failures. In order to assess the maximum level of interference it can withstand, a method of EMI testing of electronic transformers is proposed, and a test platform based on gas-insulated switchgear is constructed. To analyse the mechanism of the electronic transformer interference test, Spearman rank correlation analysis is used to analyse the overvoltage at the primary side and the interference signal at the secondary side during the switching operation, and the results show that there is a linear correlation between the amplitude of the interference voltage pulses at the secondary side port and the breakdown voltage between the breaks on the primary side. The method proposed in this study can provide technical support for the testing, analysis and suppression methods of electromagnetic interference of primary and secondary side fusion equipment in substations.